You may notice certain changes in your vision as you get older. Many adults over the age of 40 need reading glasses to cope with presbyopia, or age-related farsightedness.

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Switching back and forth between reading glasses and ordinary spectacles can be inconvenient for those who already need glasses to address myopia, or nearsightedness. Many people choose multifocal optical lenses or multifocal contact lenses to solve this inconvenience.

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Multifocal lenses are an extremely successful option for presbyopia as it eliminates switching back and forth between reading glasses and ordinary spectacles.

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Although progressive glasses are a popular option for older people with multiple prescriptions, multifocal contact lenses have several advantages in addition to addressing the three visual zones.

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Scientists who study the physics of light are experts in optics. The field of optics includes light's physical attributes and the way our eyes detect it.

Progressive lenses lack the distinctive lines on the lenses that separate each visual zone, which distinguishes them from multi/bifocal glasses. Progressive lenses allow for a smoother transition between near and far vision.

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This calculator computes the spot diameter of a collimated Gaussian beam whose wavelength is and diameter at lens when it is focused with a lens having a focal length . Additionally, the beam quality parameter can be specified if the beam deviates from an ideal Gaussian. With these inputs, the diameter of the focal spot is

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To get this diffraction-limited beam diameter, the lens should not have strong aberrations. Additionally, the lens diameter should be at least twice the beam diameter input value not to clip the "wings" of the Gaussian profile.

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For starters, many patients prefer contact lenses to glasses because of their appearance and the independence they offer.

Both multifocal glasses and multifocal contact lenses have advantages and disadvantages, and your optometrist can help you determine which is best for your eyes and lifestyle.

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Multifocal glasses, also known as ‘progressives’, correct vision in three distance zones: near, intermediate, and distant.

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where the parameter has been added to the usual definition of Rayleigh range to account for the increased divergence. The depth of field is relevant for example when focusing the beam into a nonlinear crystal for second harmonic generation.

Multifocals are available both in eyeglasses and contact lenses and your eye doctor will discuss how these lenses can enhance your lifestyle.

The adjustment period can range anywhere from a week to two months. Your eyes will adjust faster if you wear your lenses as much as possible. While adjusting to the lenses, some individuals have eye strain and headaches, so talk to your optometrist about any symptoms you’re experiencing.

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A magnifier's function is to assist your eye in focusing closer. Since a 1" focal length lens brings clear vision down to 1" from the eye, an object at this ...